Rotary engine.



PATENTED JAN. 21, 1908.

J.. MARSDBN."

ROTARY ENGINE.

APPLICATION rung) JULY 12, 1907.

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JOHN MARSDEN, OF GREENHEYS, MANCHESTER, ENGLAND.

ROTARY ENGINE.

Specification of Letters Patent.

Patented Jan. 21, 1908.

Application filed July 12. 1907. Serial No. 383.517-

To all whom it may concern:

Be it known that 1, JOHN MARsDEN, land and marine engineer, a subject ofthe King of Great Britain and Ireland, and residing at 36 Piggottstreet, Greenheys, Manchester, in the county of Lancashire, England,have invented a Reversible Turbo-Motor or R0- tary Engine, of which thefollowing is a specification.

This invention relates to reversible turbomotors or rotary engines inwhich radially sliding leverpistons are caused to revolve in a circularor annular chamber receiving the motive fluid actin upon said leverpistons, the said invention aving special reference to the means forreversing the engine and the construction of the track or race withinwhich the lever pistons run.

The accom anying drawings illustrate an engine accor 'ng to myinvention, Figure 1 being a side elevation partly in section of thesame, and Fig. 2 is a vertical section at right angles to Fig. 1 throughtwo of the lever istons and the fluid feeding compound va ve. Fig. 3 isa perspective view in cross section of a portion of the track or racefor the lever pistons.

Referring to the drawings a represents the circular chamberforcontaining the race for receiving the motive fluid, and b is aremovable valve box or casing fitted to the same by the flanges b. c isthe valve fitted thereto, for admitting the motive fluid for forwarddriving, and d is the valve for admitting the fluid for driving theengine in a reverse direction. e, e are the ports or passages leadingrespectively from the supply port 6 to the forward driving and thereversingside of the central or compressing blockf, the pressure of themotive fluid being exerted against the latter upon one or the other sideof the same. g is a disk mounted upon the driving shaft 7). and formedwith flutes g in which fit the sliding lever pistons i kept in positionby the plate 1'. These lever pistons are forced outwards by the springsis carried in the inner ends of the flutes.

To enable the pistons to clear the block f during their revolution Iprovide a cam Z mounted on a pivotal axis Z passing through a packinggland in the side or cover a of the chamber a. This cam lies in the pathof the rollers m carried by the pistons i so that as the latter revolvethey are forced inwards by the said rollers coming into contact with theinclined surface of the cam and being forced underneath the latter asshown in Fig. 1. Upon the rollers moving out of contact with the cam thepistons are forced outwards again by the springs it into the track orrace n, a portion of which is shown separately in Fig. 3 to a largerscale. This track or race is formed of a removable metal ring fixed tothe chamber a by screws or bolts 71/ passing through holes in the same.The heads of the pistons travel in a conical-shaped recess or track 0formed in the ring a, the said heads or ends of the pistons being conedto fit the recess so that the pressure of the springs 7c on the leverpistons insures the accurate fitting of the same and the wear and tearof the lever pistons is automatically taken up by the recess. Theconical shape of the recess also reduces its area and consequently theamount of working fluid used therein. The track '12, is also formed withtapered portions 12, forming the edges of the recesses 0 for engagingwith recesses formed in the edges of the disk 9 and thus insuring atight joint between the ring wand the disk. 1" is the fluid supply inletto the port 6 and s is a space into which oil is fed for supplying thebearing of the shaft h. t is the exhaust passage leading from the recess0.

In order to reverse the' engine the valve 0 is screwed down to its seatthus cutting off the motive fluid from the port 6. The cam Z is thenturned into its reversed position by means of a lever p mounted on thepivotal axis 1 of the same so as to bring its opposite inclined side orsurface in the path of the rollers m, the lever p being first turnedoutwards on its axial pin p so as to disengage the proj ection. pthereon from a notch in the cover a and engage it with a second notch inthe other position, the lever being kept in its locked position by aspring p The valve 01 is then opened thus admitting the motive fluidthrough the port a to the other side of the central block f and drivingthe pistons in the reverse direction. As the pistons revolve, theirrollers m strike against the oppositely inclined surface of the cam Zthus forcing the rollers and the pistons down for enabling the latter toclear the central block f in the manner hereinbefore described whenrevolving in the contrary direction.

Having now fully described the nature of my said invention, what Lolairnand desire to secure by Letters Patent is.

1. A turbo-motor or rotary engine consisting of a circular chamberfitted with a central driving shaft carrying a disk formed with flutesin which are fitted radially sliding lever pistons acted upon by springsfor pressing the same into a track or race removably attached to thesaid chamber and a compound valve box fitted with forward driving andreverse action valves for the admittance of motive fluid to the saidrace, substantially as described.

2. In rotary engines the track or race consisting of a metal ring fittedto the circular chamber and formed with a conical-shaped recess forreceiving the ends of lever pistons traveling therein, and havingtapered edges engaging with recesses in the disk carrying the leverpistons, substantially as described.

3. In rotary engines having radially sliding lever pistons. thecombination with the latter of an adjustable reversing cam formed withreversely inclined surfaces and pivotally carried by the outer case orchamberof the engine and actuated by a lever on its pivotal axis 'forchanging the position of the said cam and locking it in such positionand rollers carried by the lever pistons and acted upon by one or otherof the inclined surfaces of the cam in the forward or backward drivingof the engine, substantially asv described. In witness whereof Ihavehereunto set my hand in the presence of two witnesses.

. JOHN MARSDEN. Witnesses:

ARTHUR PAYNE, EDWARD E. HILL.

